The remnant of the
Champa Kingdom in a small enclave in Southeast part of Mainland Southeast Asia,
Panduranga, known to the Vietnamese as
Principality of Thuận Thành, had been annexed by the Vietnamese from the Nguyen lord's domain in 1692, who vassalized it instead of incorporating. During the
Tây Sơn rebellion (1771–1789) as the Nguyen were overthrown, Panduranga king
Po Tisuntiraidapuran switched alliance to the Tây Sơn rebels. By 1793, Panduranga effectively became a vassal client state of the Nguyen, who later conquered all of Vietnam in 1802. The first Nguyen emperor,
Gia Long, tried to keep Panduranga as a vassal state. His successor,
Minh Mạng, an absolutist, wanted to annex and assimilate the last Cham entity. However, he met challenges from the Viceroyalties of Saigon and Hanoi, and increasing Cham resistance. I
slam began proliferating in Champa from the 11th century, growing more popular after the
1471 Vietnamese conquest of Champa. It replaced or blended with traditional Hindu-Chamic customs. The majority of Cham Muslims in
Central Vietnam, including the royal family, were followers of Bani or localized Cham Shiites and still keep practicing Hindu-Chamic traditions, while on the other hand, the Cham Muslims in the Mekong Delta and Cambodia were majority Sunni. The dynamic omnipresence of the
Cham people and their diaspora communities scattered throughout Southeast Asia remains a great challenge posing to every ruler of Vietnam as well as
Cambodia. In August 1832, after the death of his foremost enemy, Viceroy of
Saigon–
Le Van Duyet, Minh Mang of Vietnam triumphantly annexed
Panduranga and held the last Cham king
Po Phaok The as royal hostage in
Hue court. Minh Mang forced the Chams to integrate, as well as purging dissents and supporters of Le Van Duyet. A Khâm Mạng (generalized as "temporary assigned") official was sent to Panduranga as the new magistrate and to punish the Chams who were suspected to be supporters of Duyet. Several Cham officials were jailed, sent to exile, or executed, and their properties were confiscated. Shortly after the purge, the Khâm Mạng office ordered the Cham to abandon their culture and practice Vietnamese customs. They forbade the Cham Bani and Sunnis to exercise Ramadhan month and Cham Hindus to worship their ancestors, completely removing the traditional Cham social hierarchy. The Vietnamese office further ordered total rapid assimilation of the Chams, integrating Panduranga into Vietnamese administration, heavy taxes, social structures, land, military services were implemented, and issued servere punishments for those who dare to oppose. Still, these policies were just to increase Cham dissatisfaction and resistance to Vietnamese subjugation. Katip Sumat, a Cambodian Cham khaṭīb who had studied Islam in
Kelantan,
Malay Peninsula, was outraged upon hearing the news that Champa had been annexed by the Hue court in 1832 and that the Vietnamese were oppressive rules over the old Panduranga. Cham sources did not assert a specific biography for Sumat, so it is unclear whether he was actually a cleric or only a religious student. He left Kelantan and returned to Cambodia in early 1833, which at the time was in a state of anarchy and being occupied by Vietnam. Sumat assembled his followers, mostly made up of Cambodian Chams and Malays secretly crossed into Panduranga, to organize an uprising against the Hue court and reclaim Cham independence. However his plan was compromised shortly after when a Cham Hindu official named
Po Kabait Thuac, fearing retaliation, reported Sumat's potential uprising to the Vietnamese court. In response, Minh Mang immediately asked all alleged Cham supporters of Katip Sumat to be arrested, but it turned out to be poor intelligence gathering of the Hue court, in which later all suspects were released and Thuac was executed by the Vietnamese court for "making false accusation." Nevertheless, Sumat was frustrating and thought that 'some of the Cham gentlemen are betraying him', and he intended to give up the movement in reluctance. But his supporters tried to convince him to continue taking lead in the uprising. Finally, the katip agreed to renew the movement, but took a more radical Islamist path over the original national liberation goal, under an Islamic banner. To prepare for the uprising, Katip Sumat gathered his followers on a cinder-core mount called Aih Amrak in
Đồng Nai province as his
sang masjid operational base, preaching the Qur'an and disseminating Islamism, gathering Muslims from various backgrounds. Then, Sumat sent his followers to the Central Highlands to teach Islam among
Churu and
Jarai villagers and recruit more fighters, demanding from his followers "absolute loyalty to Allah and Islam." His forces also murdered and kidnapped Cham Bani leaders who spoke against his radical propagation of Islam. ==Revolt in Southern Vietnam ==